diff --git a/framework/Core/lib/Horde/Session.php b/framework/Core/lib/Horde/Session.php
index 804a3cb1d93..08fee53215f 100644
--- a/framework/Core/lib/Horde/Session.php
+++ b/framework/Core/lib/Horde/Session.php
@@ -38,7 +38,6 @@ class Horde_Session
     const MODIFIED = '_m'; /* @deprecated */
     const PRUNE = '_p';
     const REGENERATE = '_r'; /* @since 2.5.0 */
-    const VERSION = '_v'; /* @since 2.12.0 */
 
     const TYPE_ARRAY = 1;
     const TYPE_OBJECT = 2;
@@ -197,8 +196,6 @@ public function setup($start = true, $cache_limiter = null,
      */
     public function start()
     {
-        global $injector, $registry;
-
         /* Limit session ID to 32 bytes. Session IDs are NOT cryptographically
          * secure hashes. Instead, they are nothing more than a way to
          * generate random strings. */
@@ -209,24 +206,11 @@ public function start()
         $this->_active = true;
         $this->_data = &$_SESSION;
 
-        try {
-            $version = $injector->getInstance('Horde_Core_Hooks')->callHook('session_version', 'horde');
-            if (!isset($this->_data[self::VERSION])) {
-                $this->_data[self::VERSION] = $version;
-                $this->sessionHandler->changed = true;
-            } elseif ($version != $this->_data[self::VERSION]) {
-                throw new Horde_Exception_AuthenticationFailure(
-                    'Session invalidated due to version ID change.',
-                     Horde_Auth::REASON_SESSION
-                );
-            }
-        } catch (Horde_Exception_HookNotSet $e) {}
-
         /* We have reopened a session. Check to make sure that authentication
          * status has not changed in the meantime. */
         if (!$this->_readonly &&
             !is_null($this->_relogin) &&
-            (($registry->getAuth() !== false) !== $this->_relogin)) {
+            (($GLOBALS['registry']->getAuth() !== false) !== $this->_relogin)) {
             Horde::log('Previous session attempted to be reopened after authentication status change. All session modifications will be ignored.', 'DEBUG');
             $this->_readonly = true;
         }
diff --git a/framework/Core/package.xml b/framework/Core/package.xml
index 839596fda87..a44d2119bd3 100644
--- a/framework/Core/package.xml
+++ b/framework/Core/package.xml
@@ -40,7 +40,6 @@
  <license uri="http://www.horde.org/licenses/lgpl21">LGPL-2.1</license>
  <notes>
 * [mms] Allow jQuery Mobile script to be packaged in same file as other jquery code.
-* [mms] Support session_version Horde hook.
 * [mms] Move configuration loading code to Horde_Registry_Loadconfig class.
 * [mjr] Fix saving S/MIME signed emails sent via ActiveSync to sent folder (Bug #12936).
 * [rla] Add method to get conf.xml defaults when conf.php is present for (Request #12923).
@@ -3304,7 +3303,6 @@
    <license uri="http://www.horde.org/licenses/lgpl21">LGPL-2.1</license>
    <notes>
 * [mms] Allow jQuery Mobile script to be packaged in same file as other jquery code.
-* [mms] Support session_version Horde hook.
 * [mms] Move configuration loading code to Horde_Registry_Loadconfig class.
 * [mjr] Fix saving S/MIME signed emails sent via ActiveSync to sent folder (Bug #12936).
 * [rla] Add method to get conf.xml defaults when conf.php is present for (Request #12923).
diff --git a/horde/config/hooks.php.dist b/horde/config/hooks.php.dist
index c171d3a7e1f..56934d40550 100644
--- a/horde/config/hooks.php.dist
+++ b/horde/config/hooks.php.dist
@@ -668,20 +668,6 @@ class Horde_Hooks
 //    }
 
 
-    /**
-     * Define a unique session version identifier that, when changed, will
-     * cause all existing (non-matching) sessions to become invalidated when
-     * subsequently accessed.
-     *
-     * @return string  Unique session version identifier.
-     */
-//     public function session_version()
-//     {
-//         // Example: Sessions become invalidated each week.
-//         return date('W-y');
-//     }
-
-
     /**
      * Modify the browser object.
      *
diff --git a/horde/docs/CHANGES b/horde/docs/CHANGES
index 893b077c972..324fcc71291 100644
--- a/horde/docs/CHANGES
+++ b/horde/docs/CHANGES
@@ -2,7 +2,6 @@
 v5.2.0-git
 ----------
 
-[mms] Added session_version hook.
 [rla] Add modular horde-cli and module for conf.php editing (Request #12923).
 [mms] By default, enforce maximum storage size on preferences values.
 [mms] Support UglifyJS for compressing javascript.
diff --git a/horde/docs/UPGRADING b/horde/docs/UPGRADING
index d40a7f6ff2a..c2d8a331848 100644
--- a/horde/docs/UPGRADING
+++ b/horde/docs/UPGRADING
@@ -69,11 +69,7 @@ The default value for the following options were changed::
 Hooks (hooks.php)
 -----------------
 
-The following hooks have been added::
-
-    session_version
-
-New ActiveSync related hooks have been added::
+New ActiveSync related hooks have been added:
 
     activesync_create_device
     activesync_device_check
diff --git a/horde/package.xml b/horde/package.xml
index cc1bbc5b147..6e82aa695ab 100644
--- a/horde/package.xml
+++ b/horde/package.xml
@@ -39,7 +39,6 @@
  </stability>
  <license uri="http://www.horde.org/licenses/lgpl">LGPL-2</license>
  <notes>
-* [mms] Added session_version hook.
 * [rla] Add modular horde-cli and module for conf.php editing (Request #12923).
 * [mms] By default, enforce maximum storage size on preferences values.
 * [mms] Support UglifyJS for compressing javascript.